import 'package:flutter/material.dart';
import 'package:flutter_app/generated/l10n.dart';
import 'package:flutter_localizations/flutter_localizations.dart';

import 'launch.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {

    var now7 = DateTime.now();
    print('-->> MyApp build: $now7');

    return MaterialApp(
      localizationsDelegates: const[
        S.delegate, //应用程序的翻译回调
        GlobalMaterialLocalizations.delegate, // Material 组件的翻译回调
        GlobalCupertinoLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate //普通 widget 的翻译回调
      ],
      //将 en 设置为第一项，并设置支持的语系
      supportedLocales: [const Locale('en', ''), ...S.delegate.supportedLocales],

      //title 的国际化回调
      onGenerateTitle: (context){
        return S.of(context).app_title;
      },

      home: new LaunchPage(),//title: S.of(context).main_title
    );
  }
}

/*
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(S.of(context).main_title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(

          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              S.of(context).msg_tip
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
*/